As it turns out, unlike the Alamo, City Hall does have a basement. And it’s got boilers, pipes, a crazy circular staircase, and a “stupendous” hidden tunnel. It’s a building many of us see, in one form or another, everyday, but we had no idea of the overall strangeness of what is under it. Our city’s most famous building has a look that everyone recognizes, but is cool and weird under the surface. It’s fitting.